Delete MediaStreamManager in the same way as AudioManager

content/browser/renderer_host/media/audio_input_device_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager_event_handler.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 24 matching lines @@
     MediaStreamProviderListener* listener,
     base::MessageLoopProxy* device_thread_loop) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(!listener_);
   DCHECK(!device_loop_);
   listener_ = listener;
   device_loop_ = device_thread_loop;
 }
 
 void AudioInputDeviceManager::Unregister() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(listener_);
   listener_ = NULL;
 }
 
 void AudioInputDeviceManager::EnumerateDevices() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(listener_);
 
   device_loop_->PostTask(
       FROM_HERE,
@@ skipping 149 matching lines @@
   if (listener_)
     listener_->Closed(content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE,
                       session_id);
 }
 
 bool AudioInputDeviceManager::IsOnDeviceThread() const {
   return device_loop_->BelongsToCurrentThread();
 }
 
 }  // namespace media_stream